Unit 6: A Trip to Another WorldTiming is Everything

Unit 6 will combine just about everything you have learned
in the previous units. Specifically, in Unit 2 we looked at how Tycho
Brahe plotted the positions of planets in the sky over years, and how
Kepler used the position data for Mars to establish that the planets
orbited the Sun in ellipses. Also, in the last unit, we saw how a spacecraft
can leave Earth orbit to head off into space. We will now examine how
a spacecraft can establish a different orbit to meet another planet
in space.

Since this unit is heavily dependent on the elliptical
orbits of planets, we strongly suggest you go back and review Unit
2.
This unit goes beyond the description in Unit 2 in that we will now
apply Kepler's Laws to directing space flight.